"fortunata dies natalis" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Lemmes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de fortunatus, dies et natalis."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Joyeux anniversaire."
      ],
      "id": "fr-fortunata_dies_natalis-la-noun-87H~b6jW"
    }
  ],
  "word": "fortunata dies natalis"
}

{
  "categories": [
    "Compositions en latin",
    "Lemmes en latin",
    "Noms communs en latin",
    "latin"
  ],
  "etymology_texts": [
    "Composé de fortunatus, dies et natalis."
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "glosses": [
        "Joyeux anniversaire."
      ]
    }
  ],
  "word": "fortunata dies natalis"
}